Answer:
B) 14g of nitrogen
Explanation:
To calculate number of molecules in 9g of water, we first convert mass to mole by using mole = mass/molar mass i.e.
mole = 9g/18g/mol of water
mole = 0.5mol
Next, we multiply by 6.022 × 10^23 molecules to get 3.011 × 10^23 molecules in 9g of water (H2O).
- For hydrogen gas: Molar Mass = 2g/mol, mass = 2g
mole = 2/2 = 1
No. of molecules = 1 × 6.022 × 10^23 = 6.022 × 10^23 molecules.
- For Nitrogen gas: Molar Mass = 28g/mol, mass = 14g
mole = 14/28 = 0.5mol
No. of molecules = 0.5 × 6.022 × 10^23 = 3.011 × 10^23 molecules.
- For Oxygen gas: Molar Mass = 32g/mol, mass = 32g
mole = 32/32 = 1mol
No. of molecules = 1 × 6.022 × 10^23 = 6.022 × 10^23 molecules.
- For carbondioxide gas: Molar Mass = 44g/mol, mass = 44g
mole = 44/44 = 1mol
No. of molecules = 1 × 6.022 × 10^23 = 6.022 × 10^23 molecules.
Based on he results of each calculation, NITROGEN contains the same number of molecules as 9g of water
tug of war results in one team pulling another team arcoss the line this is an example of .
A action forces
B reaction forces
C balanced versus
D unbalanced forces
please help me :)
Answer:
It's d love
Explanation:
Which of the following is NOT true about relative dating?
Question 4 options:
it uses radioactivity to get a more exact age of a fossil
it uses the nearby rock layers.
It finds the approximate age of fossils.
It uses fossils to help pinpoint the ages of rocks.
help me its wotrth 60 give me thr right awnser or i fail the grade
Answer:
It uses fossils to help pinpoint the ages of rocks.
Explanation:
Radiocarbon dating can not be used to determine the age of rocks.
Carbon dating works well only for objects that are less than 50,000 years. Most rocks are far older than that. Over time, carbon-14 decays gradually into nitrogen. Hence, we can not really use radiocarbon dating to determine the absolute age of a rock sample since the carbon-14 in the fossils of ancient rock samples may have completely decayed.
Si un operador debe elevar una carga de 100 Kg. ¿Con cuál de las siguientes máquinas simples va a realizar menor esfuerzo? Justifique analíticamente. a) Plano inclinado de 30° sin rozamiento. b) Palanca de primer género con un brazo de potencia de 1 mts y brazo de resistencia de 25 cm. C) Aparejo factorial con 3 poleas móviles. d) Torno con una manivela de 50 cm y el diámetro del tambor de 15 cm.
Answer:
?
Explanation:
Na2o + h2so4 ———> na2so4 + h2o
Can anyone balance this please!!??
Answer:
The equation is already balanced. There's an equal number of materials on each side of the equation.
Please respond this is very important!
Giving a lot of points!
Answer:
a
Explanation:
Water is polar and toluene is non-polar. The solution that forms will be...
A)hydration shell
B)miscible
C)supersaturated
D)immiscible
Answer:
c supersaturated
Explanation:
hope it helps tell me if i m wrong
*(d) Impure copper can be purified using electrolysis.
In this electrolysis
• the anode is made of impure copper
• the cathode is made from pure copper
• the electrolyte is copper sulfate solution.
The apparatus at the start of the experiment is shown in Figure 7.
During the electrolysis three observations are made
• the sizes of both the anode and the cathode change
• a solid appears directly beneath the anode
• the colour of the copper sulfate solution does not change.
Explain all three observations.
i will give u brainliest if u get it right
Answer:
iaiaiaiiaiaiaaiiaiaiaiaiaiia
Explanation:
babababbabahahahhahahahhahahahhahahahahahhahahahahahhahahhahahyayoenbshiwibbshhjjahjb bjkkoankokokkoekormkrokrkrk
The sizes of both the anode and the cathode change because the copper ions travel from the anode to the cathode. Therefore, a solid copper appears directly beneath the anode. The number of copper ions remains the same so there is no color in the CuSO₄ solution.
What is electrolytic refining?Electrolytic refining can be described as a process of refining metal, especially copper by the process of electrolysis. During electrolysis, impure metal is used as the anode and pure metal as the cathode.
The pure metal is formed at the cathode when the electrical current is applied by dissolving impure metal at the anode.
In copper refining, a block of impure copper is taken as an anode. CuSO₄ is used as a graphite-coated electrolyte along with pure copper, as a cathode. In electrolysis, CuSO₄ divides into a positive ion of copper (Cu²⁺) and sulfate (SO₄²⁻). The copper ion (Cu²⁺) travels made of pure copper where it absorbs the electrons from the cathode.
Learn more about electrorefining, here:
https://brainly.com/question/15124516
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15.
Which species contains 16 protons, 17 neutrons and 18 electrons?
a. 325
b. 3382-
d. 3592-
C. 345
13. Explain why changes in the concentrations of the
reactants and products at equilibrium have no effect
on the value of the equilibrium constant.
Answer:
It is temperature dependent only
Explanation:
For any system in equilibrium, the molar concentration of all species on the right hand side are related to the molar concentrations of those at the left side by a constant known as the equilibrium constant.
The equilibrium constant is a constant at a given temperature. The constant is temperature dependent only. It is not dependent on the values of concentration or pressure of a system.If 18 grams of oxygen reacts completely with 4 grams of hydrogen, we would expect how many grams of water?
A.) Less than 22 grams because some mass is lost in the reaction
B.) More than 22 grams because the oxygen gains mass during the reaction
C.) 22 grams because mass cannot be created or destroyed
D.) There is no way to tell from this information.
Answer: 22 grams because mass cannot be created or destroyed
Explanation: I just took the test
Answer:
C.) 22 grams because mass cannot be created or destroyed
Explanation:
what is a product of a chemical reaction?
Answer:
A substance that is present at the end of a chemical reaction.
A vessel of capacity 400 cc filled with chlorine under 80 cm is connected by a narrow tube and stopcock with another vessel of capacity 250 cc filled with nitrogen under 100 cm. what will be the pressure when the stopcock is opened?
Answer:
The pressure when the stopcock is opened is opened is 87.783 cm
Explanation:
The given parameters of the question are;
The volume of the vessel of chlorine = 400 cc
The pressure of the vessel of chlorine = 80 cm
The volume of the vessel of chlorine = 250 cc
The pressure of the vessel of chlorine = 100 cm
Daltons law of Partial Pressures states that the total pressure exerted by a volume of a mixture of gases is equal to the partial pressures exerted by the individual gases in the mixture with respect to the given volume
Therefore;
The total volume of the mixture = 400 cc + 250 cc = 650 cc
The partial pressure exerted by the chlorine gas in the total volume is given by Boyles law as follows;
P₁·V₁ = P₂·V₂
P₂ = P₁·V₁/V₂
Where;
P₁ = 80 cm = The pressure in volume V₁ = 400 cc
P₂ₓ = The partial pressure of chlorine in volume V₂ = 650 cc
Substituting, we have;
P₂ₓ = 80 × 400/650 ≈ 49.321 cm
Similarly, the partial pressure exerted by the nitrogen gas in the total volume is given by Boyles Law as follows;
P₂ₐ = P₁·V₁/V₂
Where;
P₁ = 100 cm = The pressure in volume V₁ = 250 cc
P₂ₐ = The partial pressure of nitrogen in volume V₂ = 650 cc
Substituting, we have;
P₂ₐ = 100× 250/650 ≈ 38.462 cm
The pressure of the combined gas, P, when the stopcock is opened is opened is given by Dalstons Law of partial pressure as P = P₂ₐ + P₂ₓ
Therefore, the pressure, P when the stopcock is opened is opened = 49.321 cm + 38.462 cm = 87.783 cm
Is the osmosis egg challenge a chemical reaction?
If so, was the stored energy in the reactants released (exothermic) or absorbed (endothermic) during this physical change?
If not, was energy released (exothermic) or absorbed (endothermic) by the molecules during this physical change?
Answer:
Answer is C because in exothermic reactions, energy releases.
in Cellular respiration,
ATP+H20 (water) = ADP+ Pi + Energy
So celullar respiration is exothermic and releases energy
Answer:
yes it is
Explanation:
because what ever you mix in it it would explode and give a chemical reaction
Which scientific law states the relationship between an object's mass, acceleration, and amount of force acting on it? *
Answer:
Newtons Second law of motion
Explanation:
Is molar volume of CH4 different from that of NH3?Explain
Answer:
Explanation:
Well At 0 °C and 1 atm pressure (STP conditions), ideal gases have a molar volume of 22.4 Liters. When the molar volumes of NH3 and CH4 are measured at STP, the molar volume of NH3 is 22.1 L and the molar volume of CH4 is 22.4 L. ... NH3 molecules take up more volume than CH4 molecules.
Which choices are layers of the atmosphere? Select the five correct answers. Mesosphere Danosphere Croposphere Stratosphere Thermosphere Exosphere Meteorosphere Troposphere
Answer:
Mesosphere
Stratosphere
Thermosphere
Troposphere
Exosphere
Explanation:
The exosphere refers to the farthest region of the atmosphere that gradually fades into space.
The troposphere is the lowest layer of atmosphere. It is the layer where weather changes occur.
The thermosphere is right above the mesosphere but just below the exosphere. It is the layer where photoionization/photodissociation of molecules occurs thereby creating ions. This largely owes to interaction of molecules in this layer with ultraviolet radiation.
The stratosphere is composed of gases. Prominent among them is ozone which serves as a blanket against the sun's ionizing radiation.
The mesosphere lies above the stratosphere but just below the thermosphere. Temperature decreases steadily with height in the mesosphere.
The 5 layers of the atmosphere are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
The atmosphere has been consisted of the 5 layers that protect the earth. The layers have been present at the height that and each layer has consisted of different constituents.
The layers of the atmosphere can be described as:
Exosphere: It has been the layer farthest to the earth and has been consisted of space.Thermosphere: It has been layer followed by the exosphere. The layer has been consisted of satellites and rockets.Mesosphere: The layer has been at the height of 50-90 km and has been consisted of meteors, stars, and meteorically rockets.Stratosphere: The layer has been at the 12-50 km height and has been consisted of radio-sounds and waves.Troposphere: The innermost layer of the atmosphere. It has consisted of clouds, planes, and balloons.The 5 layers of the atmosphere are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
For more information about the layer of the atmosphere, refer to the link:
https://brainly.com/question/3517795
A 100 kg log of wood was neatly cut into two smaller pieces. What is the total mass of all the smaller pieces put together?
Answer:
B
Explanation:
It is B because it's neatly cut into two parts, 50 and 50. That still adds up to 100 its the same total amount just cut up. So, 100 kg
Answer:
its B. 100 cleanly cut in half is 50/50. but it's still gonna be 100 total.
Explanation:
According to Dalton's theory, is it possible to convert atoms of one element into atoms of another? Explain.
please help
Answer:
No, it's not possible to change the atoms into a different element.
Explanation:
No, because rule four of his theory says that change cannot occur
The question is in the picture and if you don't know it please don't answer with a ridiculous response Thank you!
Answer: It is B.) 1s^22s^12p^1
Explanation: mind giving me brainliest? :)
Answer:
ñanamaisañia ñanamaisañia
Explanation:
n
help me please and actually try to answer :(
Protective clothing can be made from rubber or plastic, because they are good ______________________; they don't allow the flow of electrical charges.
Group of answer choices
circuits
conductors
insulators
Answer: Materials that do not allow electricity to pass easily through them are called insulators. Rubber, glass, plastic, and cloth are poor conductors of electricity. This is why electrical wires are covered in rubber, plastic, or cloth.
Explanation: I hoped that helped plzz mark me as brainliest!
the non-metal elements selenium has six electrons in its outer orbit what atoms of this element form positively charged or negatively charged ions
Answer:
positively charged -protons
Negatively charged-electrons
3. People and instruments produce different ranges of sound temperatures is this true or false
Science
10) Air masses are different in many ways. Which of these is NOT different?
a) Atmospheric pressure
b) Temperature
c) Ratio of oxygen/nitrogen
d) Moisture contents
Answer:D. Ratio of oxygen/nitrogen
Explanation: the ratio will never change no matter the air pressure!
All of these properties are for alkali metals except one
Good conductors of heat and electricity
Solids
High melting and boiling points
Silver color
Liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 1.1 g of octane is mixed with 1.04 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Round your answer to significant digits.
two of these statement about elements and atoms are true, and one is false. which statements are true
Answer:
Yeah take a pic or somethin
Explanation:
Which process releases energy that eventually produces lightning in the thunderstorm?
Answer:
Answer: B. Water condenses to form clouds.
Explanation:
When the moisture condenses, this results in the release of energy. The energy causes the air to be warm and results in the rise of air in the upper atmosphere. This process results in the instability in the atmosphere and cumulonimbus clouds are formed. These clouds support lightening during a thunderstorm.
If the reaction begins with 12.0 grams of O2 how many grams of NO2 will be produced given the following equation: 2 NO + O2 --> 2 NO2
Answer:
69g
Explanation:
Given reaction expression:
2NO + O₂ →2 NO₂
Unknown:
Mass of NO₂ produced = ?
Solution:
To solve this problem, let us use the mole concept. We solve from the known to the unknown
In this regard, find the number of moles of O₂ given;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of O₂ = 2(16g/mol) = 32g/mol
Number of moles = [tex]\frac{12}{16}[/tex] = 0.75mole
From the balanced reaction equation;
1 mole of O₂ will produce 2mole of NO₂;
0.75 mole of O₂ will produce 1.5mole of NO₂
Therefore, mass of NO₂;
Mass of NO₂ = number of moles x molar mass
Molar mass of NO₂ = 14 + 2(16) = 46g/mol
Molar mass of NO₂ = 1.5 x 46 = 69g
Write a scientific explanation that explains how modern whales differ from their ancient ancestors THIS IS A CER so can i get a claim evidence and reasoning
Answer:
Modern whales evolved by natural selection over long time periods through descent from common ancestors
Explanation:
According to the evolutionary theory proposed by Darwin, natural selection is a biological process by which organisms adapt and change in response to their environment. In this case, ancient whales that were better suited to environmental conditions survived and produced more offspring than non-adapted individuals. In consequence, predominant adaptive traits observed in modern whales were favored by natural selection in the past, while unsuccessful phenotypes progressively disappeared.